$D1-$D2/209-210: Pointer: Current Screen Line Address
Kernal-Reference:
LDA $D1 : $EA24
($D1),Y : $E606 $E63C $E763 $E7F4 $E80B $EA47
STA $D1 : $E9F3
($D1),Y : $E766 $E775 $E80E $E81D $E9D6 $EA0C $EA1E
LDA $D2 : $EA28
STA $D2 : $E9FC
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